SQL Query Question : How To Add Data To Two Tables Connected By Third Junction-table.

May 1, 2008


Hello specialists.

Maybe this is the wrong formum but I've got a question for which you probably have the answer, i hope.


Situation
------------
John is member of Group_A and Group_B
Bill is member of Group_B and Group_C
Allison is member of Group_A and Group_E

How can I create a query to input Allisons username into table 1 and groupmembership into table 2. Also updating the relationship within junction-table3 must be done automaticaly. I want to avoid duplicate records.
The final situation I want is given in red text.

The relationships between the tables are as follows
-------------------------------------------------------------
Table1 (PK)ID-Userinfo [ONE] <------------> [MANY] Table3 ID-Userinfo
Table3 (PK)ID-GroupInfo [MANY] <------------> [ONE] Table2 (PK)ID-GroupInfo

Table1: UserInfo
------------------------------
(PK)ID-Userinfo UserName
1 John
2 Bill
3 Allison

Table2: GroupInfo
------------------------------
(PK)ID-GroupInfo GroupName
1 Group_A
2 Group_B
3 Group_C

4 Group_E

Table3: MemberOf
------------------------------
(PK)ID-MemberOf ID-UserInfo ID-GroupInfo
1 1 1
2 1 2
3 2 2
4 2 3
5 3 1
6 3 4


I hope you can help me cracking this nut.

Thx in advance. Greetings Fred

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Hi i have a junction table(UserGroups) which is linking my users table with my groups table, however when the information is coming back in the format below, instead i want the group names to appear in only one field, instead of repeating the same data, could someone please tell me what i need to change




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I am trying to update 2 tables at the same time by adding new records to them and then making sure that they are related on my junction table?



Table1

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Packagename



Table2 (JunctionTable)

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JobID



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And I want to create a new package and new Job Name at the same time I would need to make multiple insert statements



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Hi i have a junction table(UserGroups) which is linking my "users" table with my "groups" table, however when the information is coming back in the format below, instead i want the group names to appear in only one field, instead of repeating the same data, could someone please tell me what i need to change.




UserName: Edwin CarolsUserAge: 28JobTitle: ManagerGroupName: MUFC

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Below is my SQL statement; 
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Hi i have a junction table(UserGroups) which is linking my "users" table with my "groups" table, however when the information is coming back in the format below, instead i want the group names to appear in only one field, instead of repeating the same data, could someone please tell me what i need to change.

UserName: Edwin Carols
UserAge: 28
JobTitle: Manager
GroupName: MUFC


UserName: Edwin Carols
UserAge: 28
JobTitle: Manager
GroupName: AFC


Below is my SQL statement;


Code:

SELECT Users.UserName,Users.UserAge, Users.JobTitle, Groups.GroupName FROM Users INNER JOIN UserGroups ON Users.UserID = UserGroups.UserID INNER JOIN Groups ON UserGroups.GroupID = Groups.GroupID WHERE (Users.UserID = '5')



And my table structure is like;

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Groups; GroupID, GroupName
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Hello specialists.

Maybe this is the wrong formum but I've got a question for which you probably have the answer, i hope.


Situation
------------
John is member of Group_A and Group_B
Bill is member of Group_B and Group_C
Allison is member of Group_A and Group_E

How can I create a query to input Allisons username into table 1 and groupmembership into table 2. Also updating the relationship within table3 must be done automaticaly. I want to avoid duplicate records.
The final situation I want is given in red text.

The relationships between the tables are as follows
-------------------------------------------------------------
Table1 (PK)ID-Userinfo [ONE] <------------> [MANY] Table3 ID-Userinfo
Table3 (PK)ID-GroupInfo [MANY] <------------> [ONE] Table2 (PK)ID-GroupInfo

Table1: UserInfo
------------------------------
(PK)ID-Userinfo UserName
1 John
2 Bill
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Table2: GroupInfo
------------------------------
(PK)ID-GroupInfo GroupName
1 Group_A
2 Group_B
3 Group_C

4 Group_E

Table3: MemberOf
------------------------------
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1 1 1
2 1 2
3 2 2
4 2 3
5 3 1
6 3 4


I hope you can help me cracking this nut.

Thx in advance. Greetings Fred

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Hello,

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http://msdn2.microsoft.com/en-us/library/ms178043.aspx

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http://msdn2.microsoft.com/en-us/library/ms189098.aspx

and these directions do not go into detail on how to do an insert on a junction table. And I cant find out how to do this anywhere on the internet... I did create a T-SQL INSERT statement in a trigger as listed below but I end up getting an error AS LISTED BELOW....

Here is how I set everything up...

PetitionSet table consists of:

PetitionSetID int auto-increment primary key
PetitionSetName varchar(50) no nulls
PetitionSetScope varchar(50) no nulls


the Petition table consists of:

PetitionID int auto-increment primary key
PetitionSetID int no nulls
PetitionName varchar(50) no nulls


the SetToPetitionJunction table consists of:
PetitionSetID int
PetitionID int

And, there is a composite key made up of both the PetitionSetID and PetitionID fields.

I have created the foreign key relationships with DEFAULT VALUES from the SetToPetitionJunction table to each column's respective corresponding column in each of the tables: PetitionSet and Petition.


The trigger is on the Petition table and it has the following code:

set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go
-- =============================================
-- Author: Name
-- Create date:
-- Description:
-- =============================================
ALTER TRIGGER .[SetToPetitionJunctionTrigger]
ON .[dbo].[Petition]
AFTER INSERT
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;

INSERT INTO SetToPetitionJunction
(PetitionID, PetitionSetID)
SELECT Petition.PetitionID, PetitionSet.PetitionSetID
FROM Petition INNER JOIN
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END

I have created an asp.net 2.0 front end to insert values into the PetitionSet table and the Petition Table. And in the detailsview for the Petition table I manually insert the PetitionSetID field to the number that corresponds to an auto-generated number on the primary key of the PetitionSet table. So I am maintaining referential integrity...

The first time it works and inserts one record in the Junction table containing the PetitionSetID from the PetitionSet table and the PetitionID from the petition table.

Then when I try to add in another petition for the same petition set number just like I did the first time and then I get this error...

Violation of PRIMARY KEY constraint 'PK_SetToPetitionJunction'. Cannot insert duplicate key in object 'dbo.SetToPetitionJunction'.
The statement has been terminated.



David

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